mirror of
https://github.com/asterisk/asterisk.git
synced 2025-11-16 23:08:32 +00:00
Add support for ICE/STUN/TURN in res_rtp_asterisk and chan_sip.
Review: https://reviewboard.asterisk.org/r/1891/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@369517 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Joshua Colp
197
res/pjproject/pjlib/include/pj/math.h
Normal file
197
res/pjproject/pjlib/include/pj/math.h
Normal file
@@ -0,0 +1,197 @@
|
||||
/* $Id$ */
|
||||
/*
|
||||
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
|
||||
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
#ifndef __PJ_MATH_H__
|
||||
#define __PJ_MATH_H__
|
||||
|
||||
/**
|
||||
* @file math.h
|
||||
* @brief Mathematics and Statistics.
|
||||
*/
|
||||
|
||||
#include <pj/string.h>
|
||||
#include <pj/compat/high_precision.h>
|
||||
|
||||
PJ_BEGIN_DECL
|
||||
|
||||
/**
|
||||
* @defgroup pj_math Mathematics and Statistics
|
||||
* @ingroup PJ_MISC
|
||||
* @{
|
||||
*
|
||||
* Provides common mathematics constants and operations, and also standard
|
||||
* statistics calculation (min, max, mean, standard deviation). Statistics
|
||||
* calculation is done in realtime (statistics state is updated on time each
|
||||
* new sample comes).
|
||||
*/
|
||||
|
||||
/**
|
||||
* Mathematical constants
|
||||
*/
|
||||
#define PJ_PI 3.14159265358979323846 /* pi */
|
||||
#define PJ_1_PI 0.318309886183790671538 /* 1/pi */
|
||||
|
||||
/**
|
||||
* Mathematical macro
|
||||
*/
|
||||
#define PJ_ABS(x) ((x) > 0 ? (x) : -(x))
|
||||
#define PJ_MAX(x, y) ((x) > (y)? (x) : (y))
|
||||
#define PJ_MIN(x, y) ((x) < (y)? (x) : (y))
|
||||
|
||||
/**
|
||||
* This structure describes statistics state.
|
||||
*/
|
||||
typedef struct pj_math_stat
|
||||
{
|
||||
int n; /* number of samples */
|
||||
int max; /* maximum value */
|
||||
int min; /* minimum value */
|
||||
int last; /* last value */
|
||||
int mean; /* mean */
|
||||
|
||||
/* Private members */
|
||||
#if PJ_HAS_FLOATING_POINT
|
||||
float fmean_; /* mean(floating point) */
|
||||
#else
|
||||
int mean_res_; /* mean residu */
|
||||
#endif
|
||||
pj_highprec_t m2_; /* variance * n */
|
||||
} pj_math_stat;
|
||||
|
||||
/**
|
||||
* Calculate integer square root of an integer.
|
||||
*
|
||||
* @param i Integer to be calculated.
|
||||
*
|
||||
* @return Square root result.
|
||||
*/
|
||||
PJ_INLINE(unsigned) pj_isqrt(unsigned i)
|
||||
{
|
||||
unsigned res = 1, prev;
|
||||
|
||||
/* Rough guess, calculate half bit of input */
|
||||
prev = i >> 2;
|
||||
while (prev) {
|
||||
prev >>= 2;
|
||||
res <<= 1;
|
||||
}
|
||||
|
||||
/* Babilonian method */
|
||||
do {
|
||||
prev = res;
|
||||
res = (prev + i/prev) >> 1;
|
||||
} while ((prev+res)>>1 != res);
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
/**
|
||||
* Initialize statistics state.
|
||||
*
|
||||
* @param stat Statistic state.
|
||||
*/
|
||||
PJ_INLINE(void) pj_math_stat_init(pj_math_stat *stat)
|
||||
{
|
||||
pj_bzero(stat, sizeof(pj_math_stat));
|
||||
}
|
||||
|
||||
/**
|
||||
* Update statistics state as a new sample comes.
|
||||
*
|
||||
* @param stat Statistic state.
|
||||
* @param val The new sample data.
|
||||
*/
|
||||
PJ_INLINE(void) pj_math_stat_update(pj_math_stat *stat, int val)
|
||||
{
|
||||
#if PJ_HAS_FLOATING_POINT
|
||||
float delta;
|
||||
#else
|
||||
int delta;
|
||||
#endif
|
||||
|
||||
stat->last = val;
|
||||
|
||||
if (stat->n++) {
|
||||
if (stat->min > val)
|
||||
stat->min = val;
|
||||
if (stat->max < val)
|
||||
stat->max = val;
|
||||
} else {
|
||||
stat->min = stat->max = val;
|
||||
}
|
||||
|
||||
#if PJ_HAS_FLOATING_POINT
|
||||
delta = val - stat->fmean_;
|
||||
stat->fmean_ += delta/stat->n;
|
||||
|
||||
/* Return mean value with 'rounding' */
|
||||
stat->mean = (int) (stat->fmean_ + 0.5);
|
||||
|
||||
stat->m2_ += (int)(delta * (val-stat->fmean_));
|
||||
#else
|
||||
delta = val - stat->mean;
|
||||
stat->mean += delta/stat->n;
|
||||
stat->mean_res_ += delta % stat->n;
|
||||
if (stat->mean_res_ >= stat->n) {
|
||||
++stat->mean;
|
||||
stat->mean_res_ -= stat->n;
|
||||
} else if (stat->mean_res_ <= -stat->n) {
|
||||
--stat->mean;
|
||||
stat->mean_res_ += stat->n;
|
||||
}
|
||||
|
||||
stat->m2_ += delta * (val-stat->mean);
|
||||
#endif
|
||||
}
|
||||
|
||||
/**
|
||||
* Get the standard deviation of specified statistics state.
|
||||
*
|
||||
* @param stat Statistic state.
|
||||
*
|
||||
* @return The standard deviation.
|
||||
*/
|
||||
PJ_INLINE(unsigned) pj_math_stat_get_stddev(const pj_math_stat *stat)
|
||||
{
|
||||
if (stat->n == 0) return 0;
|
||||
return (pj_isqrt((unsigned)(stat->m2_/stat->n)));
|
||||
}
|
||||
|
||||
/**
|
||||
* Set the standard deviation of statistics state. This is useful when
|
||||
* the statistic state is operated in 'read-only' mode as a storage of
|
||||
* statistical data.
|
||||
*
|
||||
* @param stat Statistic state.
|
||||
*
|
||||
* @param dev The standard deviation.
|
||||
*/
|
||||
PJ_INLINE(void) pj_math_stat_set_stddev(pj_math_stat *stat, unsigned dev)
|
||||
{
|
||||
if (stat->n == 0)
|
||||
stat->n = 1;
|
||||
stat->m2_ = dev*dev*stat->n;
|
||||
}
|
||||
|
||||
/** @} */
|
||||
|
||||
PJ_END_DECL
|
||||
|
||||
#endif /* __PJ_MATH_H__ */
|
||||
Reference in New Issue
Block a user